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PSTN Lines will not show as registered using MP-118

I have an AudioCodes MP-118 configured with 3CX. I can make outbound calls just fine, but no inbound calls will ring through. When I look at the Line Status in 3CX, all of the PSTN lines show not registered. What have I done wrong?

I am having the same problem. It doesn't seem like it is a problem sensing the answer, but a problem sensing ANY sound on the line at all. I find if I make a call to my cell phone and answer it softly the softphone will keep ringing. When I shout "Hello", the system recognizes the activity and hooks the call. I tried altering some of the volume settings:

Voice Volume: 5
DTMF Volume: -5
Input Gain: 0

When I pushed the gain and volume up, the system heard the call better, but the outbound volume was WAY too loud for human ears. I have been testing this thing for hours and hours with very small progress. My next setting is going to be to enable digit delivery. After that passes or fails, I think I am going to see if I can change the parameters of the line detection settings on the pstn side. I am flying blind on this one...I wish there was SOMEONE or SOME MANUAL out there that had a few of these answers. I am in for THOUSANDS of dollars, and I am starting to seriously doubt if I am going to be able to deploy this in my business.

Furthermore, I spent a lot more money on the Audiocodes router because they recommended it so highly and it had such a great reputation! I actually had more luck with a SPA-3102 by Linksys when I tested it!